[clang] [Driver] Improve error when a compiler-rt library is not found (PR #81037)

[Fangrui Song via cfe-commits]

================
@@ -44,9 +43,8 @@
 // CHECK-V6M-DEFAULTCXX: "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
 // CHECK-V6M-DEFAULTCXX: ld{{(.exe)?}}" "{{.*}}.o" "-Bstatic" "-EL"
 // CHECK-V6M-DEFAULTCXX-SAME: 
"-L{{[^"]*}}{{[/\\]+}}Inputs{{[/\\]+}}baremetal_arm{{[/\\]+}}lib"
-// CHECK-V6M-DEFAULTCXX-SAME: 
"-L[[RESOURCE_DIR]]{{[/\\]+}}lib{{[/\\]+}}baremetal"
 // CHECK-V6M-DEFAULTCXX-SAME: "-lc++" "-lc++abi" "-lunwind"
-// CHECK-V6M-DEFAULTCXX-SAME: "-lc" "-lm" "-lclang_rt.builtins-armv6m" 
"--target2=rel" "-o" "a.out"
----------------
MaskRay wrote:

Thanks for catching this. I suspect that we should improve BareMetal to not 
rely on the -L and -l for libclang_rt.builtins first. Sent #82424

https://github.com/llvm/llvm-project/pull/81037
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