Rollup merge of #65151 - tmandry:revert-emscripten-upgrade, r=tmandry

Revert #63649 - "Upgrade Emscripten targets to use upstream LLVM backend"

This change caused the runtime of the linux-asmjs builder to nearly double from 2+ hours to about 4 hours, which happens to be the bors timeout. (It made it in barely under 4 hours when it was merged.) This is causing timeouts on all new changes.

This reverts commit 7870050796, reversing
changes made to 2e7244807a.

src/test/ui/issues/issue-14875.rs

@@ -1,5 +1,5 @@
 // run-pass
-// ignore-emscripten compiled with panic=abort by default
+// ignore-wasm32-bare always compiled as panic=abort right now
 
 // Check that values are not leaked when a dtor panics (#14875)
 

src/test/ui/issues/issue-23477.rs

@@ -1,5 +1,4 @@
 // build-pass
-// ignore-asmjs wasm2js does not support source maps yet
 // compile-flags: -g
 
 pub struct Dst {

src/test/ui/issues/issue-24687-embed-debuginfo/main.rs

@@ -1,7 +1,6 @@
 // run-pass
 // aux-build:issue-24687-lib.rs
 // compile-flags:-g
-// ignore-asmjs wasm2js does not support source maps yet
 
 extern crate issue_24687_lib as d;
 

src/test/ui/issues/issue-24945-repeat-dash-opts.rs

@@ -3,7 +3,6 @@
 // as options to the compiler.
 
 // compile-flags:-g -g -O -O
-// ignore-asmjs wasm2js does not support source maps yet
 
 fn main() {
     assert_eq!(1, 1);

src/test/ui/issues/issue-26484.rs

@@ -1,6 +1,5 @@
 // run-pass
 // compile-flags:-g
-// ignore-asmjs wasm2js does not support source maps yet
 
 fn helper<F: FnOnce(usize) -> bool>(_f: F) {
     print!("");

src/test/ui/issues/issue-29948.rs

@@ -1,5 +1,5 @@
 // run-pass
-// ignore-emscripten compiled with panic=abort by default
+// ignore-wasm32-bare compiled with panic=abort by default
 
 use std::panic;
 

src/test/ui/issues/issue-33096.rs

@@ -1,6 +1,5 @@
 // run-pass
 // compile-flags: -g
-// ignore-asmjs wasm2js does not support source maps yet
 
 use std::ops::Deref;
 

src/test/ui/issues/issue-33992.rs

@@ -1,7 +1,7 @@
 // run-pass
 // ignore-windows
 // ignore-macos
-// ignore-emscripten common linkage not implemented right now
+// ignore-wasm32-bare common linkage not implemented right now
 
 #![feature(linkage)]
 

src/test/ui/issues/issue-34569.rs

@@ -1,6 +1,5 @@
 // run-pass
 // compile-flags:-g
-// ignore-asmjs wasm2js does not support source maps yet
 
 // In this test we just want to make sure that the code below does not lead to
 // a debuginfo verification assertion during compilation. This was caused by the

src/test/ui/issues/issue-36856.rs

@@ -2,7 +2,6 @@
 // Regression test for #36856.
 
 // compile-flags:-g
-// ignore-asmjs wasm2js does not support source maps yet
 
 fn g() -> bool {
     false

src/test/ui/issues/issue-42210.rs

@@ -2,7 +2,6 @@
 // Regression test for #42210.
 
 // compile-flags: -g
-// ignore-asmjs wasm2js does not support source maps yet
 
 trait Foo {
     fn foo() { }

src/test/ui/issues/issue-43853.rs

@@ -1,5 +1,5 @@
 // run-pass
-// ignore-emscripten compiled with panic=abort by default
+// ignore-wasm32-bare compiled with panic=abort by default
 
 use std::panic;
 

src/test/ui/issues/issue-45731.rs

@@ -1,7 +1,6 @@
 // run-pass
 #![allow(unused_variables)]
 // compile-flags:--test -g
-// ignore-asmjs wasm2js does not support source maps yet
 
 #[cfg(target_os = "macos")]
 #[test]

src/test/ui/issues/issue-46519.rs

@@ -1,8 +1,6 @@
 // run-pass
 // compile-flags:--test -O
 
-// ignore-emscripten compiled with panic=abort by default
-
 #[test]
 #[should_panic(expected = "creating inhabited type")]
 fn test() {

src/test/ui/issues/issue-48508.rs

@@ -8,7 +8,6 @@
 
 // compile-flags:-g
 // ignore-pretty issue #37195
-// ignore-asmjs wasm2js does not support source maps yet
 
 #![feature(non_ascii_idents)]
 

src/test/ui/issues/issue-49579.rs

@@ -1,4 +1,5 @@
 // build-pass (FIXME(62277): could be check-pass?)
+// ignore-emscripten no i128 support
 
 fn fibs(n: u32) -> impl Iterator<Item=u128> {
     (0 .. n)

src/test/ui/issues/issue-58463.rs

@@ -1,7 +1,5 @@
 // run-pass
 // compile-flags:-C debuginfo=2
-// ignore-asmjs wasm2js does not support source maps yet
-
 fn foo() -> impl Copy {
     foo
 }