[clang] [llvm] [ARM] Adding diagnostics for mcmodel=tiny when used in invalid targets (PR #125643)

[Aaron Ballman via llvm-commits]

================
@@ -44,3 +44,5 @@
 // ERR-AARCH64_32: error: unsupported argument 'small' to option '-mcmodel=' for target 'aarch64_32-unknown-linux'
 
 // ERR-LOONGARCH64-PLT-EXTREME: error: invalid argument '-mcmodel=extreme' not allowed with '-fplt'
+
+// CHECK: error: unsupported argument 'tiny' to option '-mcmodel=' for target '{{.*}}'
----------------
AaronBallman wrote:

We have nothing with a check prefix of just `CHECK` so this will never actually be tested. Also, this is the same message as `ERR-TINY` so we wouldn't need this line anyway.

https://github.com/llvm/llvm-project/pull/125643