message: Remove obsoleted NativePDB tests
  Their functionality overlaps with the newly introduced
  PostfixExpressionTests (r359288). Tests, which still exercise some
  pdb-related functionality (register name resolution) have been kept.
diff: @@ -53,36 +53,10 @@ CheckValidProgramTranslation(llvm::StringRef fpo_program,
  result_dwarf_expression.GetString().data());
  }
  -TEST(PDBFPOProgramToDWARFExpressionTests, SingleAssignmentConst) {
  - CheckValidProgramTranslation("$T0 0 = ", "$T0", "DW_OP_constu 0x0");
  -}
  -
  TEST(PDBFPOProgramToDWARFExpressionTests, SingleAssignmentRegisterRef) {
  CheckValidProgramTranslation("$T0 $ebp = ", "$T0", "DW_OP_breg6 +0");
  }
  -TEST(PDBFPOProgramToDWARFExpressionTests, SingleAssignmentExpressionPlus) {
  - CheckValidProgramTranslation("$T0 $ebp 4 + = ", "$T0",
  - "DW_OP_breg6 +0, DW_OP_constu 0x4, DW_OP_plus ");
  -}
  -
  -TEST(PDBFPOProgramToDWARFExpressionTests, SingleAssignmentExpressionDeref) {
  - CheckValidProgramTranslation("$T0 $ebp ^ = ", "$T0",
  - "DW_OP_breg6 +0, DW_OP_deref ");
  -}
  -
  -TEST(PDBFPOProgramToDWARFExpressionTests, SingleAssignmentExpressionMinus) {
  - CheckValidProgramTranslation(
  - "$T0 $ebp 4 - = ", "$T0",
  - "DW_OP_breg6 +0, DW_OP_constu 0x4, DW_OP_minus ");
  -}
  -
  -TEST(PDBFPOProgramToDWARFExpressionTests, SingleAssignmentExpressionAlign) {
  - CheckValidProgramTranslation("$T0 $ebp 128 @ = ", "$T0",
  - "DW_OP_breg6 +0, DW_OP_constu 0x80, DW_OP_lit1 "
  - ", DW_OP_minus , DW_OP_not , DW_OP_and ");
  -}
  -
  TEST(PDBFPOProgramToDWARFExpressionTests, MultipleIndependentAssignments) {
  CheckValidProgramTranslation("$T1 1 = $T0 0 =", "$T0", "DW_OP_constu 0x0");
  }
  