[nvptx] Fix autoupdater's intrinsic matcher (#73330)

Fix nvptx autoupdater's intrinsic matcher's typo'd names that used `_` (underbar), rather than '.' (dot), as a separator.

Author: urnathan

llvm/lib/IR/AutoUpgrade.cpp

@@ -632,12 +632,12 @@ static Intrinsic::ID ShouldUpgradeNVPTXBF16Intrinsic(StringRef Name) {
     return StringSwitch<Intrinsic::ID>(Name)
         .Case("bf16", Intrinsic::nvvm_fma_rn_bf16)
         .Case("bf16x2", Intrinsic::nvvm_fma_rn_bf16x2)
-        .Case("ftz_bf16", Intrinsic::nvvm_fma_rn_ftz_bf16)
+        .Case("ftz.bf16", Intrinsic::nvvm_fma_rn_ftz_bf16)
         .Case("ftz.bf16x2", Intrinsic::nvvm_fma_rn_ftz_bf16x2)
         .Case("ftz.relu.bf16", Intrinsic::nvvm_fma_rn_ftz_relu_bf16)
         .Case("ftz.relu.bf16x2", Intrinsic::nvvm_fma_rn_ftz_relu_bf16x2)
-        .Case("ftz_sat.bf16", Intrinsic::nvvm_fma_rn_ftz_sat_bf16)
-        .Case("ftz_sat.bf16x2", Intrinsic::nvvm_fma_rn_ftz_sat_bf16x2)
+        .Case("ftz.sat.bf16", Intrinsic::nvvm_fma_rn_ftz_sat_bf16)
+        .Case("ftz.sat.bf16x2", Intrinsic::nvvm_fma_rn_ftz_sat_bf16x2)
         .Case("relu.bf16", Intrinsic::nvvm_fma_rn_relu_bf16)
         .Case("relu.bf16x2", Intrinsic::nvvm_fma_rn_relu_bf16x2)
         .Case("sat.bf16", Intrinsic::nvvm_fma_rn_sat_bf16)
@@ -674,8 +674,8 @@ static Intrinsic::ID ShouldUpgradeNVPTXBF16Intrinsic(StringRef Name) {
         .Case("bf16x2", Intrinsic::nvvm_fmin_bf16x2)
         .Case("ftz.bf16", Intrinsic::nvvm_fmin_ftz_bf16)
         .Case("ftz.bf16x2", Intrinsic::nvvm_fmin_ftz_bf16x2)
-        .Case("ftz.nan_bf16", Intrinsic::nvvm_fmin_ftz_nan_bf16)
-        .Case("ftz.nan_bf16x2", Intrinsic::nvvm_fmin_ftz_nan_bf16x2)
+        .Case("ftz.nan.bf16", Intrinsic::nvvm_fmin_ftz_nan_bf16)
+        .Case("ftz.nan.bf16x2", Intrinsic::nvvm_fmin_ftz_nan_bf16x2)
         .Case("ftz.nan.xorsign.abs.bf16",
               Intrinsic::nvvm_fmin_ftz_nan_xorsign_abs_bf16)
         .Case("ftz.nan.xorsign.abs.bf16x2",