[llvm] [llvm-ml] Fix RIP-relative addressing for ptr operands (PR #107618)

[Eric Astor via llvm-commits]

================
@@ -53,4 +53,10 @@ mov eax, [t8]
 ; CHECK-LABEL: t8:
 ; CHECK: mov eax, dword ptr [t8]
 
-END
\ No newline at end of file
+t9:
+mov eax, dword ptr [bar]
----------------
ericastor wrote:

Oh - and running the same code through LLVM-ML without this change, we get:
```
0000000000000000 <t1>:
       0: 8b 04 25 00 00 00 00         	movl	0x0, %eax
		0000000000000003:  IMAGE_REL_AMD64_ADDR32	bar
```
in both cases, which is clearly not a match for ml64.

https://github.com/llvm/llvm-project/pull/107618