target/10775: m32r-elf-gcc -O3 (regrename) used lr in leaf-functions without saving

[inaoka.kazuhiro@renesas.com]

>Number:         10775
>Category:       target
>Synopsis:       m32r-elf-gcc -O3 (regrename) used lr in leaf-functions without saving
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Wed May 14 06:16:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Kazuhiro Inaoka
>Release:        gcc 3.2.3
>Organization:
>Environment:
Linux 2.4.18-24.7.x i686, target m32r-elf
>Description:
In gcc/testsuite:
FAIL: gcc.c-torture/execute/20000726-1.c execution,  -O3 -fomit-frame-pointer 
FAIL: gcc.c-torture/execute/20000726-1.c execution,  -O3 -g

When regrename optimizing (-O3) in leaf-functions, lr(R14) was used without saving.  
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
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