[llvm] [X86] LowerAsmOperandForConstraint - ensure we treat L constraint immediates as signed constants (PR #171098)

[Phoebe Wang via llvm-commits]

================
@@ -0,0 +1,15 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 6
+; RUN: llc < %s -mtriple=x86_64-- | FileCheck %s
+
+ at out = global i32 0, align 4
+define void @bar() {
+; CHECK-LABEL: bar:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    movq out at GOTPCREL(%rip), %rax
+; CHECK-NEXT:    #APP
+; CHECK-NEXT:    addq $-1, (%rax)
+; CHECK-NEXT:    #NO_APP
+; CHECK-NEXT:    retq
+  call void asm "addq $1,$0", "=*m,L,~{dirflag},~{fpsr},~{flags}"(ptr elementtype(i32) @out, i32 -1)
----------------
phoebewang wrote:

Does `elementtype(i32)` matter here?

https://github.com/llvm/llvm-project/pull/171098