[GVN] GVN/Fix rle-no-phi-translate.ll

[madhur13490]

; FIXME: This should be promotable, but memdep/gvn don't track values
; path/edge sensitively enough.

define i32 @g(ptr %b, ptr %c) nounwind {
entry:
        store i32 1, ptr %b
        store i32 2, ptr %c
        
	%t1 = icmp eq ptr %b, null		
	br i1 %t1, label %bb, label %bb2

bb:		
	br label %bb2

bb2:		
	%c_addr.0 = phi ptr [ %b, %entry ], [ %c, %bb ]		
	%cv = load i32, ptr %c_addr.0, align 4		
	ret i32 %cv
}

godbolt: https://godbolt.org/z/6PE1MqaYM

This test is marked as XFAIL. It expects no load at the end and return 2.

[madhur13490]

Hi @nikic I came across this test and curious to understand what would it take to fix this in GVN?