cglobal: Fall back to runtime intrinsic

[Keno]

Our codegen for cglobal was sharing the static_eval code for symbols with ccall. However, we do have full runtime emulation for this intrinsic, so mandating that the symbol can be statically evaluated is not required and causes semantic differences between the interpreter and codegen, which is undesirable. Just fall back to the runtime intrinsic instead.

[vtjnash]

Is this #10142?

[Keno]

It's still implemented in the runtime intrinsic path, but yes, it removes codegen support for it.

[Pangoraw]

With this change, the error message for cglobal can be removed in:

julia/src/ccall.cpp

Lines 579 to 584 in f3298ee

	static inline const char *invalid_symbol_err_msg(bool ccall)
	{
	return ccall ?
	"ccall: first argument not a pointer or valid constant expression" :
	"cglobal: first argument not a pointer or valid constant expression";
	}

since invalid_symbol_err_msg is now always called with ccall=true.