Add AccessModifierOffset to clang-format style

[labath]

Summary

As we override the indent option of the LLVM style, we need to override the access modifier
offset as well. Otherwise, classes will be formatted like such
class A
{

public:
  int foo;

};
which is not used anywhere in LLDB. This option makes clang-format style more similar to LLDB and
brings it closer to the original intention of LLVM style, which was to not indent access
modifiers.

[tfiala]

Hey Jim, this looks right to me. Agree?

-Todd

[jingham]

We don't indent access modifiers, so if AccessModifierOffset does what it's name suggests, then that's right.

Jim

[tfiala]

I think we're good with this then, Pavel.

lldb/trunk/.clang-format

 BasedOnStyle: LLVM
 IndentWidth:     4
 ColumnLimit:     120
 BreakBeforeBraces: Allman
 AlwaysBreakAfterDefinitionReturnType: true
 AllowShortFunctionsOnASingleLine: Inline
 ConstructorInitializerAllOnOneLineOrOnePerLine: true
 IndentCaseLabels: true
+AccessModifierOffset: -4