Add test for using 32-bit sanitizers on 64-bit host

cross-compile-i686/main.fmf

@@ -0,0 +1,38 @@
+summary: compiler-rt test for rhbz#1678240
+test: "$WITH_SCL ./test.sh"
+require: []
+framework: shell
+tier: 1
+component:
+  - llvm-toolset
+  - compiler-rt
+
+adjust:
+  # Common requirements when LLVM is not SCL-ized
+  - enabled: false
+    because: "Test applicable only on x86_64 arch"
+    when: arch != x86_64
+
+  - require+:
+      - clang
+      - compiler-rt
+      - compiler-rt.i686
+      - glibc-devel.i686
+    when: collection is not defined
+
+  # Requirements for SCL-ized LLVM
+  - require+:
+      - llvm-toolset-13.0-clang
+      - llvm-toolset-13.0-compiler-rt
+      - llvm-toolset-13.0-compiler-rt.i686
+    when: collection == llvm-toolset-13.0
+  - require+:
+      - llvm-toolset-14.0-clang
+      - llvm-toolset-14.0-compiler-rt
+      - llvm-toolset-14.0-compiler-rt.i686
+    when: collection == llvm-toolset-14.0
+  - require+:
+      - llvm-toolset-15.0-clang
+      - llvm-toolset-15.0-compiler-rt
+      - llvm-toolset-15.0-compiler-rt.i686
+    when: collection == llvm-toolset-15.0

cross-compile-i686/test.c

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+int main(){return 0;}

cross-compile-i686/test.sh

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+#!/bin/sh -eux
+
+clang -m32 -fsanitize=address test.c