[CC1Option] Add the option to enable the debug entry values

The option enables debug info about parameter's entry values.

The example of using the option:

clang -g -O2 -Xclang -femit-debug-entry-values test.c

In addition, when the option is set add the flag all_call_sites
in a subprogram in order to support GNU extension as well.

([3/13] Introduce the debug entry values.)

Co-authored-by: Ananth Sowda <asowda@cisco.com>
Co-authored-by: Nikola Prica <nikola.prica@rt-rk.com>
Co-authored-by: Ivan Baev <ibaev@cisco.com>

Differential Revision: https://reviews.llvm.org/D58033

llvm-svn: 364399