[Clang] Handle ppc_fp128 in N3364 test (NFC)

On powerpc long double may be ppc_fp128, so add corresponding
cases to the test.

Author: nikic

clang/test/C/C2y/n3364.c

@@ -37,6 +37,6 @@ double d3 = -DBL_SNAN;
 long double ld1 = LDBL_SNAN;
 long double ld2 = +LDBL_SNAN;
 long double ld3 = -LDBL_SNAN;
-// CHECK: @ld1 = {{.*}}global {{double 0x7FF4000000000000|x86_fp80 0xK7FFFA000000000000000|fp128 0xL00000000000000007FFF400000000000}}
-// CHECK: @ld2 = {{.*}}global {{double 0x7FF4000000000000|x86_fp80 0xK7FFFA000000000000000|fp128 0xL00000000000000007FFF400000000000}}
-// CHECK: @ld3 = {{.*}}global {{double 0xFFF4000000000000|x86_fp80 0xKFFFFA000000000000000|fp128 0xL0000000000000000FFFF400000000000}}
+// CHECK: @ld1 = {{.*}}global {{double 0x7FF4000000000000|x86_fp80 0xK7FFFA000000000000000|fp128 0xL00000000000000007FFF400000000000|ppc_fp128 0xM7FF40000000000000000000000000000}}
+// CHECK: @ld2 = {{.*}}global {{double 0x7FF4000000000000|x86_fp80 0xK7FFFA000000000000000|fp128 0xL00000000000000007FFF400000000000|ppc_fp128 0xM7FF40000000000000000000000000000}}
+// CHECK: @ld3 = {{.*}}global {{double 0xFFF4000000000000|x86_fp80 0xKFFFFA000000000000000|fp128 0xL0000000000000000FFFF400000000000|ppc_fp128 0xMFFF40000000000008000000000000000}}