[clang] [Driver] Pass correct alignment for -falign-functions with no argument (PR #101257)

[Saleem Abdulrasool via cfe-commits]

================
@@ -1982,7 +1982,7 @@ unsigned tools::ParseFunctionAlignment(const ToolChain 
&TC,
     return 0;
 
   if (A->getOption().matches(options::OPT_falign_functions))
-    return 0;
+    return 4; // log2(16)
----------------
compnerd wrote:

@pogo59 that is documented in the GCC documentation. Many, if not most, of the 
driver arguments are GCC derived and behave identically.

https://github.com/llvm/llvm-project/pull/101257
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