[z/OS] Make MinGlobalAlign consistent with SystemZ

Remove overriding MinGlobalAlign to 0 for z/OS target to be consistent with SystemZ.

Reviewed By: abhina.sreeskantharajan

Differential Revision: https://reviews.llvm.org/D106890

clang/lib/Basic/Targets/OSTargets.h

@@ -796,7 +796,6 @@ public:
     this->UseZeroLengthBitfieldAlignment = true;
     this->UseLeadingZeroLengthBitfield = false;
     this->ZeroLengthBitfieldBoundary = 32;
-    this->MinGlobalAlign = 0;
     this->DefaultAlignForAttributeAligned = 128;
   }
 };