Assembler failures in multiple tests on nightly-x86_64-linux-deb10-no_tntc-validate

One example of many:

/tmp/ghc306691_0/ghc_1.s: Assembler messages:
/tmp/ghc306691_0/ghc_1.s:136:0: error:
     Error: symbol `.Lc2oQ_end' is already defined
/tmp/ghc306691_0/ghc_1.s:137:0: error:
     Error: symbol `.Lc2oQ_proc_end' is already defined
/tmp/ghc306691_0/ghc_1.s:241:0: error:
     Error: symbol `.Lc2oE_end' is already defined
/tmp/ghc306691_0/ghc_1.s:242:0: error:
     Error: symbol `.Lc2oE_proc_end' is already defined
/tmp/ghc306691_0/ghc_1.s:357:0: error:
     Error: symbol `.Lc2or_end' is already defined
/tmp/ghc306691_0/ghc_1.s:358:0: error:
     Error: symbol `.Lc2or_proc_end' is already defined
<no location info>: error:
    `gcc' failed in phase `Assembler'. (Exit code: 1)
*** unexpected failure for T14894(optasm)

Job #1210736 failed for 8d2dbe2d: