[asan] Fix odr_c_test failure with gold linker

Summary:
Adds another global to asan's odr_c_test to help force the target global to
not lie at the start of bss with the gold linker where it is always
aligned.

Patch by Derek Bruening!

llvm-svn: 262678

compiler-rt/test/asan/TestCases/Linux/odr_c_test.c

@@ -13,6 +13,9 @@
 #if defined(FILE1)
 __attribute__((aligned(8))) int x;
 __attribute__((aligned(1))) char y;
+// The gold linker puts ZZZ at the start of bss (where it is aligned)
+// unless we have a large alternative like Displace:
+__attribute__((aligned(1))) char Displace[105];
 __attribute__((aligned(1))) char ZZZ[100];
 #elif defined(FILE2)
 int ZZZ = 1;