[clang] [llvm] [DirectX] Add isinf f16 emulation for SM6.8 and lower (PR #156932)

[Sarah Spall via cfe-commits]

================
@@ -180,7 +180,8 @@ class Triple {
     DXILSubArch_v1_6,
     DXILSubArch_v1_7,
     DXILSubArch_v1_8,
-    LatestDXILSubArch = DXILSubArch_v1_8,
+    DXILSubArch_v1_9,
+    LatestDXILSubArch = DXILSubArch_v1_9,
----------------
spall wrote:

i'm not familiar with this code. What is the effect of the latestdxilsubarch? 
is it ok to set it to 1.9?

https://github.com/llvm/llvm-project/pull/156932
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