[llvm] [Hexagon] Use fast-math flags (PR #162274)

[via llvm-commits]

================
@@ -108,10 +108,8 @@ def FeatureNVS: SubtargetFeature<"nvs", "UseNewValueStores", "true",
       "Support for new-value stores", [FeaturePackets]>;
 def FeatureSmallData: SubtargetFeature<"small-data", "UseSmallData", "true",
       "Allow GP-relative addressing of global variables">;
-def FeatureDuplex: SubtargetFeature<"duplex", "EnableDuplex", "true",
-      "Enable generation of duplex instruction">;
-def FeatureUnsafeFP: SubtargetFeature<"unsafe-fp", "UseUnsafeMath", "true",
-      "Use unsafe FP math">;
+def FeatureDuplex : SubtargetFeature<"duplex", "EnableDuplex", "true",
+                                     "Enable generation of duplex instruction">;
----------------
aankit-ca wrote:

Unrelated change. Please remove this

https://github.com/llvm/llvm-project/pull/162274