[BUG] Compiler crash with (indirect) self referential type

[lsh]

Bug description

If there is a self referential type, where the value is behind a pointer such that it should be valid, it still causes a compiler crash.

Steps to reproduce

struct Val:
    alias _Storage = Variant[
        String,
        Dict[String, Val],
    ]
    var _value: Self._Storage

    fn isa[T: CollectionElement](self) -> Bool:
        return self._value.isa[T]()

    fn __init__(inout self, string: String):
        self._value = string

    fn __init__(inout self, dict: Dict[String, Val]):
        self._value = dict

    fn __moveinit__(inout self, owned rhs: Self):
        self._value = rhs._value

    fn __copyinit__(inout self, rhs: Self):
        self._value = rhs._value


fn main():
    print(Val(str("a")).isa[String]())

outputs

 #0 0x000000010427ed58 llvm_strlcpy (/Users/lukas/.modular/pkg/packages.modular.com_nightly_mojo/bin/mojo+0x1000bed58)
 #1 0x000000010427d12c llvm_strlcpy (/Users/lukas/.modular/pkg/packages.modular.com_nightly_mojo/bin/mojo+0x1000bd12c)
 #2 0x000000010427f3f8 llvm_strlcpy (/Users/lukas/.modular/pkg/packages.modular.com_nightly_mojo/bin/mojo+0x1000bf3f8)
 #3 0x000000018393b584 (/usr/lib/system/libsystem_platform.dylib+0x180477584)
 #4 0x00000001054e0d7c mbedtls_version_get_number (/Users/lukas/.modular/pkg/packages.modular.com_nightly_mojo/bin/mojo+0x101320d7c)
 #5 0x00000001054e1158 mbedtls_version_get_number (/Users/lukas/.modular/pkg/packages.modular.com_nightly_mojo/bin/mojo+0x101321158)
 #6 0x000000010580714c mbedtls_version_get_number (/Users/lukas/.modular/pkg/packages.modular.com_nightly_mojo/bin/mojo+0x10164714c)
 #7 0x0000000183834548 (/usr/lib/libc++.1.dylib+0x180370548)
 #8 0x00000001058ac8e0 mbedtls_version_get_number (/Users/lukas/.modular/pkg/packages.modular.com_nightly_mojo/bin/mojo+0x1016ec8e0)
 #9 0x00000001058b2034 mbedtls_version_get_number (/Users/lukas/.modular/pkg/packages.modular.com_nightly_mojo/bin/mojo+0x1016f2034)
#10 0x00000001058b1d70 mbedtls_version_get_number (/Users/lukas/.modular/pkg/packages.modular.com_nightly_mojo/bin/mojo+0x1016f1d70)
#11 0x00000001058b1e0c mbedtls_version_get_number (/Users/lukas/.modular/pkg/packages.modular.com_nightly_mojo/bin/mojo+0x1016f1e0c)
#12 0x000000018390af94 (/usr/lib/system/libsystem_pthread.dylib+0x180446f94)
#13 0x0000000183905d34 (/usr/lib/system/libsystem_pthread.dylib+0x180441d34)

System information

- What OS did you do install Mojo on ? MacOS
- Provide version information for Mojo by pasting the output of `mojo -v`
mojo 2024.7.2705 (4b7a0ee2)
- Provide Modular CLI version by pasting the output of `modular -v`
modular 0.7.2 (d0adc668)