[MC][test] Change ELF/uleb-ehtable.s Mach-O to use private symbols in .uleb128 for label differences

On Mach-O, `.uleb128 A-B` where A and B are separated by a non-private symbol is invalid
(see D153167).

Author: MaskRay

llvm/test/MC/ELF/uleb-ehtable.s

@@ -1,7 +1,7 @@
 // RUN: llvm-mc -filetype=obj -triple i686-pc-linux-gnu    %s -o - | llvm-readobj -S --sd - | FileCheck %s -check-prefix=CHECK -check-prefix=ELF
 // RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu  %s -o - | llvm-readobj -S --sd - | FileCheck %s -check-prefix=CHECK -check-prefix=ELF
-// RUN: llvm-mc -filetype=obj -triple i386-apple-darwin9   %s -o - | llvm-readobj -S --sd - | FileCheck %s -check-prefix=CHECK -check-prefix=MACHO
-// RUN: llvm-mc -filetype=obj -triple x86_64-apple-darwin9 %s -o - | llvm-readobj -S --sd - | FileCheck %s -check-prefix=CHECK -check-prefix=MACHO
+// RUN: llvm-mc -filetype=obj -triple i386-apple-darwin9 --defsym MACHO=1 %s -o - | llvm-readobj -S --sd - | FileCheck %s -check-prefix=CHECK -check-prefix=MACHO
+// RUN: llvm-mc -filetype=obj -triple x86_64-apple-darwin9 --defsym MACHO=1 %s -o - | llvm-readobj -S --sd - | FileCheck %s -check-prefix=CHECK -check-prefix=MACHO
 
 // Test that we can assemble a GCC-like EH table that has 16381-16383 bytes of
 // non-padding data between .ttbaseref and .ttbase. The assembler must insert
@@ -13,11 +13,20 @@
 foo:
         .byte 0xff  // LPStart omitted
         .byte 0x1   // TType encoding (uleb128)
+.ifdef MACHO
+        .uleb128 Lttbase-Lttbaseref
+Lttbaseref:
+.else
         .uleb128 .ttbase-.ttbaseref
 .ttbaseref:
+.endif
         .fill 128*128-1, 1, 0xcd    // call site and actions tables
         .balign 4
+.ifdef MACHO
+Lttbase:
+.else
 .ttbase:
+.endif
         .byte 1, 2, 3, 4
 
 // ELF:   Name: .data