Cleanup x86_mmx after removing IR type (#100646)

After #98505, the textual IR keyword `x86_mmx` was temporarily made to
parse as `<1 x i64>`, so as not to require a lot of test update noise.

This completes the removal of the type, by removing the`x86_mmx` keyword
from the IR parser, and making the (now no-op) test updates via `sed -i
's/\bx86_mmx\b/<1 x i64>/g' $(git grep -l x86_mmx llvm/test/)`.
Resulting bitcasts from <1 x i64> to itself were then manually deleted.

Changes to llvm/test/Bitcode/compatibility-$VERSION.ll were reverted, as
they're intended to be equivalent to the .bc file, if parsed by old
LLVM, so shouldn't be updated.

A few tests were removed, as they're no longer testing anything, in the
following files:
- llvm/test/Transforms/GlobalOpt/x86_mmx_load.ll
- llvm/test/Transforms/InstCombine/cast.ll
- llvm/test/Transforms/InstSimplify/ConstProp/gep-zeroinit-vector.ll

Works towards issue #98272.

1 files changed, 0 insertions, 2 deletions

diff --git a/llvm/lib/AsmParser/LLLexer.cpp b/llvm/lib/AsmParser/LLLexer.cpp
index c82e749..7c97f7a 100644
--- a/llvm/lib/AsmParser/LLLexer.cpp
+++ b/llvm/lib/AsmParser/LLLexer.cpp
@@ -838,8 +838,6 @@ lltok::Kind LLLexer::LexIdentifier() {
   TYPEKEYWORD("ppc_fp128", Type::getPPC_FP128Ty(Context));
   TYPEKEYWORD("label",     Type::getLabelTy(Context));
   TYPEKEYWORD("metadata",  Type::getMetadataTy(Context));
-  TYPEKEYWORD("x86_mmx", llvm::FixedVectorType::get(
-                             llvm::IntegerType::get(Context, 64), 1));
   TYPEKEYWORD("x86_amx",   Type::getX86_AMXTy(Context));
   TYPEKEYWORD("token",     Type::getTokenTy(Context));
   TYPEKEYWORD("ptr",       PointerType::getUnqual(Context));