[clang] [llvm] [HLSL] Adding HLSL `clip` function. (PR #114588)

[Finn Plummer via cfe-commits]

================
@@ -0,0 +1,77 @@
+; RUN: llc -verify-machineinstrs -O0 -mtriple=spirv-unknown-unknown %s -o - | 
FileCheck %s --check-prefixes=CHECK,SPIRV15
+; RUN: llc -verify-machineinstrs 
-spirv-ext=+SPV_EXT_demote_to_helper_invocation -O0 
-mtriple=spirv32v1.6-unknown-unknown %s -o - | FileCheck %s 
--check-prefixes=CHECK,SPIRV16
+; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv-unknown-unknown %s -o - 
-filetype=obj | spirv-val %}
----------------
inbelic wrote:

```suggestion
; RUN: llc -verify-machineinstrs -O0 -mtriple=spirv1.5-unknown-unknown %s -o - 
| FileCheck %s --check-prefixes=CHECK,SPIRV15
; RUN: llc -verify-machineinstrs 
-spirv-ext=+SPV_EXT_demote_to_helper_invocation -O0 
-mtriple=spirv1.5-unknown-unknown %s -o - | FileCheck %s 
--check-prefixes=CHECK,SPIRV16
; RUN: llc -verify-machineinstrs -O0 -mtriple=spirv1.6-unknown-unknown %s -o - 
| FileCheck %s --check-prefixes=CHECK,SPIRV16
; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv1.5-unknown-unknown %s -o - 
-filetype=obj | spirv-val %}
; RUN: %if spirv-tools %{ llc -O0 
-spirv-ext=+SPV_EXT_demote_to_helper_invocation 
-mtriple=spirv1.5-unknown-unknown %s -o - -filetype=obj | spirv-val %}
; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv1.6-unknown-unknown %s -o - 
-filetype=obj | spirv-val %}
```

We should fix the spirv version for 1.5 and add the extra runs for the 
different combinations.

https://github.com/llvm/llvm-project/pull/114588
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