relax msan error-pattern due to LLVM changes

Author: TimNN

src/test/ui/sanitize/memory-eager.rs

@@ -10,7 +10,7 @@
 // run-fail
 // error-pattern: MemorySanitizer: use-of-uninitialized-value
 // error-pattern: Uninitialized value was created by an allocation
-// error-pattern: in the stack frame of function 'random'
+// error-pattern: in the stack frame
 //
 // This test case intentionally limits the usage of the std,
 // since it will be linked with an uninstrumented version of it.