Bump LDC-LLVM to v22.1.2

[kinke]

No description provided.

[kinke]

Almost green, just:

• the 2nd vtable load isn't elided anymore for the 2nd call in:
  

  ldc/tests/codegen/devirtualization_assumevtable.d

  Lines 43 to 49 in 795e80a

  	void exacttypeunknown(A a, A b)
  	{
  	// CHECK: %[[FOO:[0-9a-z]+]] = load {{.*}}!invariant
  	// CHECK: call{{.*}} void %[[FOO]](
  	a.foo();
  	// CHECK: call{{.*}} void %[[FOO]](
  	a.foo();

• a little regression for 32-bit x86, with error: 64-bit offset calculated but target is 32-bit:

  ldc/tests/dmd/compilable/test23705.d

  Lines 5 to 8 in 795e80a

  	void main ()
  	{
  	ubyte [0x7fff_fffe] x;
  	}