Missing source location for betterC TypeInfo error

[DaveP1776]

Output of ldc2 --version:

LDC - the LLVM D compiler (1.24.0):                                                   
  based on DMD v2.094.1 and LLVM 11.0.0
  built with LDC - the LLVM D compiler (1.24.0)                                           
  Default target: x86_64-unknown-linux-gnu 
...

A minimal program, compiled with -betterC:

extern(C) int main(){
    int[] foo = [1];
    return 0;
}

Yields the error message:

Error: TypeInfo cannot be used with -betterC

With dmd, the error message is:

bug.d(2): Error: TypeInfo cannot be used with -betterC

In other words, the error message indicates file and line.

This can be quite frustrating in larger source files.

It looks like this happens because a default constructed Loc is passed into getOrCreateTypeInfoDeclaration at https://github.com/ldc-developers/ldc/blob/master/gen/llvmhelpers.cpp#L1200

[kinke]

Fixed by #3632.