Fix another error in backport of #37101 impacting Windows.

src/debuginfo.cpp

@@ -1695,3 +1695,21 @@ uint64_t jl_getUnwindInfo(uint64_t dwAddr)
     uv_rwlock_rdunlock(&threadsafe);
     return ipstart;
 }
+
+extern "C"
+uint64_t jl_trygetUnwindInfo(uint64_t dwAddr)
+{
+    // Might be called from unmanaged thread
+    Optional<std::map<size_t, ObjectInfo, revcomp>*> maybeobjmap = jl_jit_events->trygetObjectMap();
+    if (maybeobjmap) {
+        std::map<size_t, ObjectInfo, revcomp> &objmap = **maybeobjmap;
+        std::map<size_t, ObjectInfo, revcomp>::iterator it = objmap.lower_bound(dwAddr);
+        uint64_t ipstart = 0; // ip of the start of the section (if found)
+        if (it != objmap.end() && dwAddr < it->first + it->second.SectionSize) {
+            ipstart = (uint64_t)(uintptr_t)(*it).first;
+        }
+        uv_rwlock_rdunlock(&threadsafe);
+        return ipstart;
+    }
+    return 0;
+}

src/julia_internal.h

@@ -758,6 +758,7 @@ typedef struct {
 
 // Might be called from unmanaged thread
 uint64_t jl_getUnwindInfo(uint64_t dwBase);
+uint64_t jl_trygetUnwindInfo(uint64_t dwBase);
 #ifdef _OS_WINDOWS_
 #include <dbghelp.h>
 JL_DLLEXPORT EXCEPTION_DISPOSITION __julia_personality(