[RemoteInspection] Use bool instead of !!.

Since this is adjacent to a `!=` operator, explicitly using `bool` seems clearer.

Co-authored-by: Evan Wilde <etceterawilde@gmail.com>

Author: al45tair

include/swift/RemoteInspection/ReflectionContext.h

@@ -616,7 +616,7 @@ class ReflectionContext
             std::string SecName(Start, StringSize);
             if (SecName != Name)
               continue;
-            if (Retained != !!(Hdr->sh_flags & llvm::ELF::SHF_GNU_RETAIN))
+            if (Retained != bool(Hdr->sh_flags & llvm::ELF::SHF_GNU_RETAIN))
               continue;
             RemoteAddress SecStart =
                 RemoteAddress(ImageStart.getAddressData() + Hdr->sh_addr);