[compiler-rt][builtins] Un-xfail two tests on sparcv9

Two tests currently `XPASS` on sparcv9:

  Unexpectedly Passed Tests (2):
    Builtins-sparcv9-sunos :: compiler_rt_logbl_test.c
    Builtins-sparcv9-sunos :: divtc3_test.c

The following patch fixes this.

Tested on `sparcv9-sun-solaris2.11`.

Differential Revision: https://reviews.llvm.org/D85119

compiler-rt/test/builtins/Unit/compiler_rt_logbl_test.c

@@ -1,9 +1,5 @@
 // RUN: %clang_builtins %s %librt -o %t && %run %t
 
-//
-// Bug 42496
-// XFAIL: sparcv9-target-arch
-//
 #define QUAD_PRECISION
 #include <math.h>
 #include <stdio.h>

compiler-rt/test/builtins/Unit/divtc3_test.c

@@ -3,8 +3,8 @@
 // REQUIRES: c99-complex
 
 //
-// 32-bit: Bug 42493, 64-bit: Bug 42496
-// XFAIL: sparc
+// Bug 42493
+// XFAIL: sparc-target-arch
 //
 #include <stdio.h>