[llvm] [X86] Apply the data32 mode switch in the Intel matcher (PR #212417)

[Phoebe Wang via llvm-commits]

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@@ -4600,6 +4601,20 @@ bool X86AsmParser::matchAndEmitIntelInstruction(
     MCStreamer &Out, uint64_t &ErrorInfo, bool MatchingInlineAsm) {
   X86Operand &Op = static_cast<X86Operand &>(*Operands[0]);
   SMRange EmptyRange;
+  // In 16-bit mode, if data32 is specified, temporarily switch to 32-bit mode
+  // when matching the instruction. The mode must be restored before the
+  // instruction is emitted, or the 32-bit form loses its 0x66 prefix. Matching
+  // has several error returns, so a guard covers those.
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phoebewang wrote:

Isn't there only one return in line 4715?

https://github.com/llvm/llvm-project/pull/212417