merge GCC 10.4 into gcc.old.

merge GCC 9.3 into gcc.old.

merge GCC 8.4 into gcc.old.

merge gcc 7.4 into gcc.old part 2.

merge GCC 6.5.0 into gcc.old.

merge GCC 6.4 into gcc.old.

add the spectre mitigation options for x86:

-mindirect-branch=<choice>
-mfunction-return=<choice>
-mindirect-branch-register

the values for 'choice' are "keep" (default, existing behaviour),

add the spectre mitigation options for x86:

-mindirect-branch=<choice>
-mfunction-return=<choice>
-mindirect-branch-register

the values for 'choice' are "keep" (default, existing behaviour),
"thunk", "thunk-inline", and "thunk-extern".

as taken from the Ubuntu port of these changes in their
ubuntu:gcc-5_5.5.0-8ubuntu1.diff. i've also included the doc
updates that are missing from ubuntu from gcc itself.


i've tested both i386 and amd64 fairly heavily with these options
enabled in both kernels and userland, atf runs and hundreds of
package builds.

XXX: pullup-8 to gcc/ not gcc.old/

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merge GCC 5.4 into gcc.old.

re-merge GCC 4.8.5 (part 1)

import the -current GCC 4.5 sources as gcc.old in preparation for
upgrading the normal GCC to 4.8.

this tree has had ChangeLog entries removed, as well as all the
other components we delete, and "on

import the -current GCC 4.5 sources as gcc.old in preparation for
upgrading the normal GCC to 4.8.

this tree has had ChangeLog entries removed, as well as all the
other components we delete, and "only" weighs in around 140MB now.

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