[clang] Align -ffp-model=fast denormal handling with -ffast-math (PR #89477)

[Fangrui Song via cfe-commits]

================
@@ -5,12 +5,15 @@
 
 // crtfastmath enables ftz and daz
 // RUN: %clang -### -target x86_64-unknown-linux-gnu -ffast-math --sysroot=%S/Inputs/basic_linux_tree -c %s -v 2>&1 | FileCheck -check-prefix=CHECK-PRESERVESIGN %s
+// RUN: %clang -### -target x86_64-unknown-linux-gnu -ffp-model=fast --sysroot=%S/Inputs/basic_linux_tree -c %s -v 2>&1 | FileCheck -check-prefix=CHECK-PRESERVESIGN %s
----------------
MaskRay wrote:

`--target=` for newer tests. `-target ` has been deprecated since Clang 3.4

https://github.com/llvm/llvm-project/pull/89477