Auto merge of #88321 - glaubitz:m68k-linux, r=wesleywiser

Add initial support for m68k

This patch series adds initial support for m68k making use of the new M68k
backend introduced with LLVM-13. Additional changes will be needed to be
able to actually use the backend for this target.

src/tools/build-manifest/src/main.rs

@@ -99,6 +99,7 @@ static TARGETS: &[&str] = &[
     "i686-unknown-freebsd",
     "i686-unknown-linux-gnu",
     "i686-unknown-linux-musl",
+    "m68k-unknown-linux-gnu",
     "mips-unknown-linux-gnu",
     "mips-unknown-linux-musl",
     "mips64-unknown-linux-gnuabi64",

src/tools/compiletest/src/util.rs

@@ -54,6 +54,7 @@ const ARCH_TABLE: &[(&str, &str)] = &[
     ("i386", "x86"),
     ("i586", "x86"),
     ("i686", "x86"),
+    ("m68k", "m68k"),
     ("mips", "mips"),
     ("mips64", "mips64"),
     ("mips64el", "mips64"),