pgsql: Support inlining various small performance-critical functions on

Log Message:
-----------
Support inlining various small performance-critical functions on non-GCC
compilers, by applying a configure check to see if the compiler will accept
an unreferenced "static inline foo ..." function without warnings.  It is
believed that such warnings are the only reason not to declare inlined
functions in headers, if the compiler understands "inline" at all.

Kurt Harriman

Modified Files:
--------------
    pgsql/config:
        c-compiler.m4 (r1.19 -> r1.20)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/config/c-compiler.m4?r1=1.19&r2=1.20)
    pgsql:
        configure (r1.669 -> r1.670)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure?r1=1.669&r2=1.670)
        configure.in (r1.621 -> r1.622)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure.in?r1=1.621&r2=1.622)
    pgsql/src/backend/nodes:
        list.c (r1.73 -> r1.74)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/list.c?r1=1.73&r2=1.74)
    pgsql/src/backend/utils/mmgr:
        mcxt.c (r1.68 -> r1.69)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mmgr/mcxt.c?r1=1.68&r2=1.69)
    pgsql/src/include/nodes:
        pg_list.h (r1.62 -> r1.63)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/nodes/pg_list.h?r1=1.62&r2=1.63)
    pgsql/src/include:
        pg_config.h.in (r1.145 -> r1.146)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/pg_config.h.in?r1=1.145&r2=1.146)
        pg_config.h.win32 (r1.66 -> r1.67)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/pg_config.h.win32?r1=1.66&r2=1.67)
    pgsql/src/include/port:
        win32.h (r1.91 -> r1.92)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/port/win32.h?r1=1.91&r2=1.92)
    pgsql/src/include/portability:
        instr_time.h (r1.5 -> r1.6)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/portability/instr_time.h?r1=1.5&r2=1.6)
    pgsql/src/include/utils:
        palloc.h (r1.42 -> r1.43)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/utils/palloc.h?r1=1.42&r2=1.43)