It successfully build a deb .I build all with gcc except gfx/skia build with 
clang .
There is again a crash but It looks now is not in _sk_xor__vfp4 the asm code 
where it crash is different from the asm code of _sk_xor__vfp4  .

firefox -g
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Reading symbols from /usr/lib/firefox/firefox...(no debugging symbols 
(gdb) run
Starting program: /usr/lib/firefox/firefox 
Cannot parse expression `.L1185 4@r4'.
warning: Probes-based dynamic linker interface failed.
Reverting to original interface.

[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/arm-linux-gnueabihf/".
[New Thread 0xf2522450 (LWP 2431)]
[New Thread 0xf1d22450 (LWP 2432)]
[Thread 0xf1d22450 (LWP 2432) exited]
[New Thread 0xf1d22450 (LWP 2433)]
[New Thread 0xed17b450 (LWP 2434)]
[New Thread 0xec97b450 (LWP 2435)]
[New Thread 0xec17b450 (LWP 2436)]
[New Thread 0xf12ff450 (LWP 2437)]
[New Thread 0xf10ff450 (LWP 2438)]
[New Thread 0xeb97b450 (LWP 2439)]
[New Thread 0xeb77b450 (LWP 2440)]
[New Thread 0xeb57b450 (LWP 2441)]
[New Thread 0xeb37b450 (LWP 2442)]
[New Thread 0xeb17b450 (LWP 2443)]
Thread 1 "firefox" received signal SIGSEGV, Segmentation fault.
0xf4c3dcb4 in ?? () from /usr/lib/firefox/
(gdb) disas /r 0xf4c3dca0,0xf4c3dcd0
Dump of assembler code from 0xf4c3dca0 to 0xf4c3dcd0:
   0xf4c3dca0:  9b 68   ldr     r3, [r3, #8]
   0xf4c3dca2:  05 eb 83 03     add.w   r3, r5, r3, lsl #2
   0xf4c3dca6:  16 46   mov     r6, r2
   0xf4c3dca8:  0f 46   mov     r7, r1
   0xf4c3dcaa:  98 44   add     r8, r3
   0xf4c3dcac:  20 99   ldr     r1, [sp, #128]  ; 0x80
   0xf4c3dcae:  d9 e9 00 23     ldrd    r2, r3, [r9]
   0xf4c3dcb2:  82 46   mov     r10, r0
=> 0xf4c3dcb4:  c1 e9 00 23     strd    r2, r3, [r1]
   0xf4c3dcb8:  d9 f8 04 30     ldr.w   r3, [r9, #4]
   0xf4c3dcbc:  7b 33   adds    r3, #123        ; 0x7b
   0xf4c3dcbe:  00 f0 4b 81     beq.w   0xf4c3df58
   0xf4c3dcc2:  b1 69   ldr     r1, [r6, #24]
   0xf4c3dcc4:  c1 f3 56 25     ubfx    r5, r1, #9, #23
   0xf4c3dcc8:  21 f4 ff 71     bic.w   r1, r1, #510    ; 0x1fe
   0xf4c3dccc:  21 f0 01 01     bic.w   r1, r1, #1

I dnt know where this asm code belongs too . I dnt know in what function
it crash , but is not in sk jumper generated .

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  Firefox crashes at start on armv7L after 55.0.1 update

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