[PATCH] thp: Limit THP code padding to 2 * THP page size

[H.J. Lu]

Since R_ARC_S25W_PCREL range is limited, 32MB THP code padding leads to
relocation overflow:

.../support/libsupport_nonshared.a(support_test_main.oS):
in function `support_test_main':
.../support/support_test_main.c:396:(.text+0x650): relocation
truncated to fit: R_ARC_S25W_PCREL_PLT against symbol `atexit' defined
in .text section in
../glibc/libc_nonshared.a(atexit.oS)
.../install/compilers/arc-linux-gnu/arc-glibc-linux-gnu/bin/ld: final
link failed
collect2: error: ld returned 1 exit status

Limit THP code padding to 2 * THP page size to avoid R_ARC_S25W_PCREL
relocation overflow.

Tested natively for Linux/x86-64 and Linux/i686 as well as with
build-many-glibcs.py for arc-linux-gnu.

This fixes BZ #34311


-- 
H.J.
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