[RISCV] Enable a test that works these days

Author: jrtc27

llvm/test/CodeGen/RISCV/cheri/double-imm.ll

@@ -1,10 +1,9 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; Check that .LCPI symbols have a size associated with them.
-; TODO: Enable once BuildPairF64 works for purecap
-; RUNNOT: %riscv32_cheri_purecap_llc -mattr=+d -verify-machineinstrs < %s \
-; RUNNOT:   | FileCheck --check-prefix=CHECK,IL32PC64 %s
+; RUN: %riscv32_cheri_purecap_llc -mattr=+d -verify-machineinstrs < %s \
+; RUN:   | FileCheck %s
 ; RUN: %riscv64_cheri_purecap_llc -mattr=+d -verify-machineinstrs < %s \
-; RUN:   | FileCheck --check-prefixes=CHECK,L64PC128 %s --allow-unused-prefixes
+; RUN:   | FileCheck %s
 
 ; CHECK-LABEL: .rodata.cst8,"aM",@progbits,8
 ; CHECK-NEXT:  .p2align 3