[Common/x86] Add utility macros for X86_32 PIC support
[Common/x86] Add utility macros for X86_32 PIC support

Add utility macros that enable offsetting from the program counter
to avoid absolute addresses when X86_32_PICASM is enabled.

shihuade/openh264,GuangweiWang/openh264,shihuade/openh264,cisco/openh264,mstorsjo/openh264,shihuade/openh264,shihuade/openh264,ruil2/openh264,mstorsjo/openh264,GuangweiWang/openh264,sijchen/openh264,mstorsjo/openh264,GuangweiWang/openh264,cisco/openh264,cisco/openh264,sijchen/openh264,GuangweiWang/openh264,GuangweiWang/openh264,cisco/openh264,cisco/openh264,sijchen/openh264,GuangweiWang/openh264,shihuade/openh264,ruil2/openh264,cisco/openh264,shihuade/openh264,ruil2/openh264,sijchen/openh264,ruil2/openh264,GuangweiWang/openh264,mstorsjo/openh264,sijchen/openh264,mstorsjo/openh264,ruil2/openh264,cisco/openh264,ruil2/openh264,mstorsjo/openh264,mstorsjo/openh264,sijchen/openh264,shihuade/openh264,ruil2/openh264,sijchen/openh264