47192f4 Auto-sync with upstream branch master

Authored and Committed by djdelorie 5 years ago
    Auto-sync with upstream branch master
    
    Upstream commit: 25f7a3c96116a9102df8bf7b04ef160faa32416d
    
    - malloc: make malloc fail with requests larger than PTRDIFF_MAX (BZ#23741)
    - powerpc: Fix format issue from 3a16dd780eeba602
    - powerpc: fma using builtins
    - powerpc: Use generic fabs{f} implementations
    - mips: Remove rt_sigreturn usage on context function
    - powerpc: Remove rt_sigreturn usage on context function
    - support: Add support_capture_subprogram
    - stdlib/tst-secure-getenv: handle >64 groups
    
        
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