[clang] [CIR] Fix assumption that 'curFn' is always a function in direct-call (PR #197766)

[Erich Keane via cfe-commits]

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@@ -2194,8 +2194,9 @@ CIRGenCallee CIRGenFunction::emitDirectCallee(const GlobalDecl &gd) {
 
     // When directing calling an inline builtin, call it through it's mangled
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erichkeane wrote:

I can fix this as a drive by :) 

https://github.com/llvm/llvm-project/pull/197766