[llvm] [CI] Add flang-rt to pre-merge configuration (PR #156039)

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``````````diff
--- compute_projects.py	2025-08-29 14:49:11.000000 +0000
+++ compute_projects.py	2025-08-29 14:52:21.198442 +0000
@@ -50,11 +50,11 @@
     },
     "lld": {"bolt", "cross-project-tests"},
     "clang": {"clang-tools-extra", "cross-project-tests", "lldb"},
     "mlir": {"flang"},
     # Test everything if ci scripts are changed.
-    #".ci": {
+    # ".ci": {
     #    "llvm",
     #    "clang",
     #    "CIR",
     #    "lld",
     #    "lldb",
@@ -63,11 +63,11 @@
     #    "mlir",
     #    "polly",
     #    "flang",
     #    "libclc",
     #    "openmp",
-    #},
+    # },
 }
 
 # This mapping describes runtimes that should be enabled for a specific project,
 # but not necessarily run for testing. The only case of this currently is lldb
 # which needs some runtimes enabled for tests.

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https://github.com/llvm/llvm-project/pull/156039