[llvm] [X86][GlobalIsel] Support IS_FP_CLASS intrinsic 1/4 (PR #151084)

[Evgenii Kudriashov via llvm-commits]

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@@ -3,6 +3,8 @@
 ; RUN: llc < %s -mtriple=x86_64-linux | FileCheck %s -check-prefixes=X64,X64-SDAGISEL
 ; RUN: llc < %s -mtriple=i686-linux -fast-isel -fast-isel-abort=1  | FileCheck %s -check-prefixes=X86-FASTISEL
 ; RUN: llc < %s -mtriple=x86_64-linux -fast-isel -fast-isel-abort=1  | FileCheck %s -check-prefixes=X64,X64-FASTISEL
+; RUN: llc < %s -mtriple=i686-linux -global-isel -global-isel-abort=1 | FileCheck %s -check-prefixes=X86
----------------
e-kud wrote:

```suggestion
; RUN: llc < %s -mtriple=i686-linux -global-isel -global-isel-abort=1 | FileCheck %s -check-prefixes=X86-GISEL
```
I see that SDAG matches GlobalISel in most of the times. Does it make sense to create a common prefix `X86` for GlobalISel and SDAG?

https://github.com/llvm/llvm-project/pull/151084