[RISCV][ASAN] Fix passing XFAIL tests

[luismarques]

Summary

These tests pass for RV64 Linux, but they are marked as XFAIL. This patch fixes that.

compiler-rt/test/asan/TestCases/Linux/odr-violation.cpp

 // FIXME: https://code.google.com/p/address-sanitizer/issues/detail?id=316
 // XFAIL: android
 // Fails with debug checks: https://bugs.llvm.org/show_bug.cgi?id=46862
-// XFAIL: !compiler-rt-optimized
+// XFAIL: !compiler-rt-optimized && !riscv64
 //
 // We use fast_unwind_on_malloc=0 to have full unwinding even w/o frame
 // pointers. This setting is not on by default because it's too expensive.
 //
 // Different size: detect a bug if detect_odr_violation>=1
 // RUN: %clangxx_asan -DBUILD_SO=1 -fPIC -shared %s -o %dynamiclib
 // RUN: %clangxx_asan %s %ld_flags_rpath_exe -o %t-ODR-EXE
 // RUN: %env_asan_opts=fast_unwind_on_malloc=0:detect_odr_violation=1 not %run %t-ODR-EXE 2>&1 | FileCheck %s

compiler-rt/test/asan/TestCases/Linux/odr-vtable.cpp

 // Fails with debug checks: https://bugs.llvm.org/show_bug.cgi?id=46862
-// XFAIL: !compiler-rt-optimized
+// XFAIL: !compiler-rt-optimized && !riscv64
 
 // RUN: %clangxx_asan -fno-rtti -DBUILD_SO1 -fPIC -shared %s -o %dynamiclib1
 // RUN: %clangxx_asan -fno-rtti -DBUILD_SO2 -fPIC -shared %s -o %dynamiclib2
 // RUN: %clangxx_asan -fno-rtti %s %ld_flags_rpath_exe1 %ld_flags_rpath_exe2 -o %t
 // RUN: %env_asan_opts=fast_unwind_on_malloc=0:detect_odr_violation=2 not %run %t 2>&1 | FileCheck %s
 
 struct XYZ {
   virtual void foo();